Schütt, M; Borken, W; Stange, CF; Matzner, E: Substantial net N mineralization during the dormant season in temperate forest soils, Journal of Plant Nutrition and Soil Science, 177, 566-572 (2014), doi:10.1002/jpln.201300644
Abstract:
In temperate forest soils, nitrogen (N) net mineralization has been extensively investigated during the growing season, whereas N cycling during winter was barely addressed. Here, we quantified net ammonification and nitrification during the dormant season by in situ and laboratory incubations in soils of a temperate European beech and a Norway spruce forest. Further, we compared temperature dependency of N net mineralization in in situ field incubations with those from laboratory incubations at controlled temperatures.

From November to April, in situ N net mineralization of the organic and upper mineral horizons amounted to 10.9 kg N ha-1 6 months-1 in the spruce soil and to 44.3 kg N ha-1 6 months-1 in the beech soil, representing 65% (beech) and 26% (spruce) of the annual above ground litterfall. N net mineralization was largest in the Oi/Oe horizon and lowest in the A and EA horizons. Net nitrification in the beech soil (1.5 kg N ha-1 6 months-1) was less than in the spruce soil (5.9 kg N ha-1 6 months-1).

In the range of soil temperatures observed in the field (0 – +4°C), the temperature dependency of N net mineralization was low in the spruce soil. In the beech soil, the apparent temperature dependency of N net mineralization was much larger than in spruce and more pronounced in laboratory incubations than in the in situ incubations.

In temperate forest soils N net mineralization during the dormant season contributes substantially to the annual N cycling, especially in deciduous sites with large amounts of litterfall immediately before the dormant season. High Q10 values of N net mineralization at low temperatures suggest a huge effect of future increasing winter temperature on the N cycle especially in deciduous forests.

Upcoming ...


BayCEER Colloquium:
Th. 2018-06-21
The tangled evolutionary history of plants and fungi
Mo. 2018-06-25
Öffentliche Vorträge im Rahmen der Besetzung der Professur "Sportökologie"
Geographisches Kolloquium:
Tu. 2018-06-19
Land/water use management of wetlands of Lakes Haramaya and Zwai and their watersheds: A crossroad between development, sustainability and climate change?
Ökologisch-Botanischer Garten:
We. 2018-06-20
Botanische Mittagspause
We. 2018-06-27
Harmlos bis tödlich: Krankheiten der Bäume
Weather research site
Luftdruck (356m): 977.8 hPa
Lufttemperatur: 14.0 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: 7 h/d
Wind (Höhe 17m): 4.1 km/h
Wind (Max.): 7.6 km/h
Windrichtung: SW

...more
Globalstrahlung: 1 W/m²
Lufttemperatur: 11.7 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: 11 h/d
Wind (Höhe 32m): 4.7 km/h
Wind (Max.): 9.3 km/h

...more